Avoid VM log messages about uncaught errors
Avoid VM log messages about uncaught errors

We defer doc updates to a child process so that we avoid mixing fabric
messages together between HTTP requests. This just makes the defer
cleaner so that the VM doesn't log when we throw a conflict error.

BugzId: 24264

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb